According to Piesat Information Technology, on November 9th, the "Hongtu-2" of the Nuwa constellation was successfully launched into orbit using a one rocket four satellites method at the Jiuquan Satellite Launch Center. These four X-band radar remote sensing (X-SAR) satellites are in a Sun-synchronous orbit. The four satellites are in a 90-degree phase difference formation in orbit, which can significantly shorten the revisit cycle and coverage observation time. The satellites will provide remote sensing data services for China's water conservancy business. The four X-SAR satellites of the "Hongtu-2" launched this time will form a space network with the four InSAR satellites of the already running "Hongtu-1" in orbit.